CN103190094A - Optical communication system disaster capacity method, device and disaster capacity system - Google Patents
Optical communication system disaster capacity method, device and disaster capacity system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/035—Arrangements for fault recovery using loopbacks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0791—Fault location on the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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- H—ELECTRICITY
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- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0289—Optical multiplex section protection
- H04J14/0291—Shared protection at the optical multiplex section (1:1, n:m)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0293—Optical channel protection
- H04J14/0294—Dedicated protection at the optical channel (1+1)
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Abstract
One embodiment of the invention relates to an optical communication system disaster capacity method, an optical add-drop multiplexer branch unit and a disaster capacity system. The optical communication system disaster capacity method using the optical add-drop multiplexer (OADM) comprises a step of detecting a transmission link failure in an optical communication system, a step of switching a link of the transmission link failure from a punchthrough state to a loopback state when the transmission link failure is detected to loop back an optical signal input from a non-fault end of the line to be output from the non-fault end. With the scheme provided by the embodiment, a power level in the link of the transmission link failure is maintained when a case of the transmission link failure occurs in the optical communication system, and thus stable transmission performance is maintained, and a disaster capacity capability of the optical communication system is improved. In addition, the scheme provided by the embodiment of the invention does not introduce extra energy into a transmission link, so that spontaneous radiation noise cannot be introduced, and performances of the system are guaranteed.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of optical communication system disaster recovery method, optical add/drop multiplexer branch units and disaster tolerance system.
Background technology
Fast development along with information technology, the sea cable network coverage each big marine site, the whole world, marine-cable light fiber communication system generally adopts dense wave division multipurpose (Dense Wavelength Division Multiplexing, DWDM) technology has become the important communication network of carrying important international telecommunication service.In extra large cable network, use optical add/drop multiplexer branch units (Optical Add-Drop Multiplexer Branching Unit, OADM BU) networking can take full advantage of the fine right capacity of optical fiber, effectively reduce cost and reduce propagation delay time.Yet OADM BU networking brings bigger difficulty and challenge for network design and management, especially is embodied in disaster tolerance and non-linear management aspect.
Fig. 1 shows the situation of a kind of OADM of utilization BU networking.As seen, comprise A website, B website and C website and the OADM BU that they are connected in this network, wherein the link between A website and the B website belongs to the main line, and the link between C website and the OADM BU belongs to branch road.Between A website, B website, C website and OADM BU, be respectively arranged with optical repeater.When the failure condition of main line A website to the disconnected cable of generation between the OADM BU or the electric leakage of extra large cable, the professional light of A side can't arrive OADM BU, and OADM BU has only ripple business on the C website to the survival business of B website direction so.The marine-cable light repeater operation is under degree of depth saturated conditions, gross output is constant, owing to lose the A website to the punch-through service signal of B website, this will cause the C website to be amplified to bigger multiple to the service signal of B website, signal list glistening light of waves power increases, might cause very high nonlinear transport cost to make and system performance degradation have influence on the proper communication between C website and the B website.
Summary of the invention
The embodiment of the invention has proposed a kind of optical communication system disaster recovery method, device and disaster tolerance system, to reduce the transmission link fault for the influence of optical communication system.
On the one hand, the embodiment of the invention has proposed a kind of disaster recovery method that uses the optical communication system of optical add/drop multiplexer OADM, comprise: detect the transmission link fault in the optical communication system, when detecting the transmission link fault, the link of described transmission link guilty culprit is switched to wrapped state from pass-through state, make the light signal of importing from an end that does not have fault of described link be looped back to this end output.
On the other hand, the embodiment of the invention has proposed a kind of optical add/drop multiplexer branch units OADM BU, be configured to when the transmission link fault appears in the transmission link at described OADM BU place, the link of described transmission link guilty culprit is switched to wrapped state from pass-through state, make the light signal of importing from an end that does not have fault of described link be looped back to this end output, wherein said OADM BU specifically comprises at least one optical coupling loopback apparatus, at least two main line ports and at least one tributary port, described optical coupling loopback apparatus is connected on the main line between the port of main line, perhaps be connected on the branch road at tributary port place, perhaps be connected on the described main line and described branch road on, described optical coupling loopback apparatus has pass-through state and wrapped state, when there is the transmission link fault in the link at optical coupling loopback apparatus place, pass-through state when described optical coupling loopback apparatus can be from operate as normal switches to wrapped state, makes to be looped back to this end output from the light signal of the end input that does not have fault of described optical coupling loopback apparatus.
On the other hand, the embodiment of the invention has proposed a kind of disaster tolerance system of optical communication, comprising: checkout gear, and for detection of the transmission link fault in the optical communication system, and above-mentioned optical add/drop multiplexer branch units.
As seen, scheme by the embodiment of the invention proposes can occur in optical communication system under the situation of transmission link fault, keeps the power level in the link of this transmission link guilty culprit, thereby keep stable transmission performance, improved the disaster tolerance ability of optical communication system.In addition, in the scheme of the embodiment of the invention, extra energy is not introduced in the transmission link, therefore can not introduced spontaneous emission noise, guaranteed the performance of system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 shows the situation of a kind of OADM of utilization BU networking;
Fig. 2 shows the flow chart according to the disaster recovery method of the optical communication system of a kind of OADM of use of the embodiment of the invention;
The situation that the optical communication system of utilizing OADM BU networking of showing Fig. 3 breaks down;
Fig. 4 shows the schematic diagram according to the disaster tolerance system of the optical communication system of the embodiment of the invention;
Fig. 5 shows the situation of OADM BU when the transmission link fault does not take place optical communication system according to an embodiment of the invention;
Fig. 6 shows the situation of OADM BU when main line transmission link fault takes place optical communication system according to an embodiment of the invention;
Fig. 7 shows the situation of OADM BU when optical communication system generation branch road transmission link fault according to an embodiment of the invention;
Fig. 8 shows the embodiment of the invention that only realizes the disaster tolerance function in the main line;
Fig. 9 shows the embodiment of the invention that only realizes the disaster tolerance function in branch road;
Figure 10 shows a kind of OADM BU of four ports;
Figure 11 also shows the OADM BU of another kind of four ports;
Figure 12 a and Figure 12 b show the another kind of way of realization according to the optical coupling loopback apparatus of the embodiment of the invention; And
Figure 13 shows the another kind of way of realization according to the optical coupling loopback apparatus of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is carried out clear, complete description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work belongs to the scope of protection of the invention.
Need to prove that the transmission link fault that relates in the embodiment of the invention comprises that the scheme of the embodiment of the invention wherein can produce the various fault scenes of beneficial effect, especially comprise disconnected cable in the extra large cable fault scenes, electric leakage, underwater installation fault etc.It interrupts cable and normally disconnects owing to ship anchor, fishery operation, seabottom geology activity etc. cause cable, and common phenomenon of the failure is that optical fiber and cable disconnect simultaneously.Electric leakage is normally leaked electricity to the seawater short circuit owing to reasons such as wearing and tearing, burn into marine organisms destruction cause extra large cable feed part.The underwater installation fault for example refers to undersea optical repeater because faults itself (comprising various possible causes such as electric, optics), and reason causes luminous power to reduce or no-output.
Fig. 2 shows the flow chart according to the disaster recovery method of the optical communication system of a kind of OADM of use of the embodiment of the invention.From Fig. 2 as seen, this method may further comprise the steps:
Step 201: detect the transmission link fault in the optical communication system.At this, can come the detected transmission link failure by variety of way well-known to those skilled in the art, optical time domain reflection (Optical Time Domain Reflectmeter for example, OTDR) method, dc impedance detection method, dc capacitor detection method, alternating current method etc. do not specifically describe this.By step 201, can determine the link of transmission link guilty culprit.When the transmission link fault occurs in the main line, determine that the link at described transmission link place is the main line, and when the transmission link fault occurs in the branch road, determine that the link at described transmission link place is branch road.
Step 202: when detecting the transmission link fault, the link of described transmission link guilty culprit is switched to wrapped state from pass-through state, make to be looped back to this end output from the light signal of the end input that does not have fault of described link.One skilled in the art will appreciate that in optical communication system branch road still is that the main line all comprises two opposite transmission directions usually.The inventor notices, for same link, can have similar signal spectral distribution from the signal of end input to the signal of exporting from this end, therefore, by the light signal of the one end input of described link being looped back to this end output when the transmission link fault, can utilize the signal of this end input to compensate the signal power of losing owing to the transmission link fault.Here be noted that, in this step 202, the link of described transmission link guilty culprit is switched to wrapped state from pass-through state, make the light signal of importing from an end that does not have fault of described link be looped back to this end output, here whether loopback does not carry out any restriction to the light signal of an out of order end, can carry out loopback (if having light signal) to it, also can not carry out loopback.This also can describe below in conjunction with specific embodiments.
The situation that the optical communication system of utilizing OADM BU networking of showing Fig. 3 breaks down.In this optical communication system, have A, B, three websites of C, be the main line between the AB, be branch road between OADM BU and the C.Three disconnected cable scenes in Fig. 3, have been schematically shown, its interruption cable scene 1 is to break down in the main line between website A and OADM BU, disconnected cable scene 2 is to break down in the main line between website B and OADM BU, and disconnected cable scene 3 is that the branch road between website C and OADMBU breaks down.Generally ripple is less up and down for the OADM branch road, and the professional ripple of break-through is more between the main line.Therefore, under the situation of the disconnected cable in main line (disconnected cable scene 1, disconnected cable scene 2), if there are not other compensation mechanism, then tributary signal is bigger through single wave power variation after being connected the optical repeater in the main line, means that the disconnected cable situation in main line is bigger to the influence of branch service.Therefore, in the situation of disconnected cable scene 1, disconnected cable fault appears in the main line that detects in step 201 between A end and the OADM BU, thereby in step 202, will hold the light signal that is input to the A end still to be looped back to the output of B end from B, utilize the light signal compensation from the B end of this loopback to hold the light signal of B end owing to the disconnected cable fault between A end and the OADM BU causes the A that loses, thereby reduce the influence of holding the light signal of B end for C as far as possible.In other words, under the situation of loopback, yet the signal of end comprises from C end and sends to the signal of B end and send to the signal that the A end is looped back to the B end from the B end from OADM BU to B.Similarly, in the situation of disconnected cable scene 2, hold the light signal that is input to the B end to be looped back to the A end A and export the light signal that the B that recovers damage holds the A end.
The professional less situation of ripple about branch road, the branch road cable (disconnected cable scene 3) that breaks is less for the influence of the service feature between the website of main line, therefore in this case, can ignore the disconnected cable of branch road, not carry out the above-mentioned operation that switches to wrapped state when also being branch trouble.Yet under the professional more situation of ripple, the disconnected cable of branch road influences and can not ignore the service feature between the website of main line about branch road.Therefore, similarly, the link of transmission link guilty culprit is switched to wrapped state from pass-through state, make to be looped back to this end output from the light signal of the end input that does not have fault of described link.About the situation of branch road, also can describe in detail in conjunction with concrete structure in the following embodiments.
What expect easily is that said method can only not design at branch road at the main line yet, has only realized the disaster recovery method of branch road this moment.
Preferably, after step 202, continue the transmission link of optical communication system is detected.When detecting the disappearance of transmission link fault, the link of controlling described transmission link guilty culprit switches to pass-through state from wrapped state.
As seen, in the scheme that the embodiment of the invention proposes, the light signal of when the transmission link fault end that does not have fault of this guilty culprit link being imported is looped back to this end output, utilize the signal of this end input to compensate the signal that loses owing to the transmission link fault, keep the power level in the link of this transmission link guilty culprit, thereby reduced the influence of transmission link fault for other business as much as possible, kept stable transmission performance, improved the disaster tolerance ability of optical communication system.In addition, in the scheme of the embodiment of the invention, extra energy is not introduced in the transmission link, therefore can not introduced spontaneous emission noise, guaranteed the performance of system.
Correspondingly, the embodiment of the invention has proposed a kind of optical add/drop multiplexer branch units OADM BU, it is configured to when the transmission link fault appears in the transmission link at described OADM BU place, the link of described transmission link guilty culprit is switched to wrapped state from pass-through state, make the light signal of importing from an end of described link be looped back to this end output.As seen, utilize this OADM BU, can realize the method described in above-described embodiment.
Fig. 4 shows the schematic diagram according to the disaster tolerance system of the optical communication system of the embodiment of the invention.As seen, disaster tolerance system 400 comprises:
Optical add/drop multiplexer branch units 420, be used for when described checkout gear detects the transmission link fault, the link of described transmission link guilty culprit is switched to wrapped state from pass-through state, make the light signal of importing from an end that does not have fault of described link be looped back to this end output.Wherein said OADM BU specifically comprises at least one optical coupling loopback apparatus, at least two main line ports and at least one tributary port, described optical coupling loopback apparatus is connected on the main line between the port of main line, perhaps be connected on the branch road at tributary port place, perhaps be connected on the described main line and described branch road on, described optical coupling loopback apparatus has pass-through state and wrapped state, when there is the transmission link fault in the link at optical coupling loopback apparatus place, pass-through state when described optical coupling loopback apparatus can be from operate as normal switches to wrapped state, makes to be looped back to this end output from the light signal of the end input that does not have fault of described optical coupling loopback apparatus.
In embodiments of the present invention, the various checkout gears that can adopt those skilled in the art to be familiar with come the detected transmission link failure.For example, can adopt the optical time domain reflection checkout gear, it adopts optical time domain reflection technology detection fiber link breakpoint.Perhaps, can adopt the dc impedance checkout gear.Because in most of the cases, the phenomenon of the failure of cable is conductor and the contact with sea water in the middle of the cable, so the dc impedance checkout gear can use the dc impedance detection method in this case, in conjunction with the dc impedance parameter fault location point of cable, underwater installation.Perhaps, can adopt the dc capacitor checkout gear, it is particularly suited for, and conductor in the power cable does not have and the situation of contact with sea water.The dc capacitor checkout gear is measured the electric capacity between middle conductor and the seawater, by the result of calculation based on test data, can estimate the position of fault point.Perhaps, can adopt the interchange checkout gear, wherein by power supply unit (Power Feeding Equipment, PFE) load the ac current signal with low frequency and amplitude in DC source, and ac current signal radiates electromagnetic wave to space outerpace in the transmission of lead, thereby the maintenance ship finds signal by the induction detection instrument of special use in the seabed, and then determines extra large cable location of fault.Perhaps, can also use other checkout gear, for example can whether come the failure judgement point unusually by input, the Output optical power that reads underwater installation.
According to a form of implementation, the optical add/drop multiplexer branch units also comprises wavelength division multiplexer, for the road of closing of the feedthrough signal of going up ripple signal and main line, perhaps descends the shunt of the feedthrough signal in ripple signal and the main line.At this, also can use coupler to substitute wavelength division multiplexer.
According to a form of implementation, the optical add/drop multiplexer branch units that described optical add/drop multiplexer branch units is three ports.
The concrete course of work about checkout gear 410 and optical add/drop multiplexer branch units 420 can no longer repeat here referring to the description of top correlation method part.
As seen, in the scheme that the embodiment of the invention proposes, the light signal of when the transmission link fault end that does not have fault of this guilty culprit link being imported is looped back to this end output, utilize the signal of this end input to compensate the signal that loses owing to the transmission link fault, keep the power level in the link of this transmission link guilty culprit, thereby reduced the influence of transmission link fault for other business as much as possible, kept stable transmission performance, improved the disaster tolerance ability of optical communication system.In addition, in the scheme of the embodiment of the invention, extra energy is not introduced in the transmission link, therefore can not introduced spontaneous emission noise, guaranteed the performance of system.
Come disaster tolerance system is described further below in conjunction with concrete structure.
Fig. 5 shows the situation of OADM BU when the transmission link fault does not take place optical communication system according to an embodiment of the invention.This OADM BU has three external-connected ports, is respectively A end, B end and C end.
As seen from Figure 5, this OADM BU comprise 4 wavelength division multiplexers (Wavelength Division Multiplexer, WDM) and 3 optical coupling loopback apparatus.4 wavelength division multiplexers are connected to interconnection place of main line and branch road, be used for to realize the partial wave of ripple and break-through ripple up and down and close ripple.At this, also can use coupler to substitute wavelength division multiplexer.The optical coupling loopback apparatus is connected in main line and the branch road.The optical coupling loopback apparatus has 4 ports, and wherein the annexation between port can be configured as required.At least can be configured to two states, pass-through state: 1 port is communicated with to 2 ports, and 3 ports are communicated with to 4 ports; Wrapped state: 3 ports are communicated with to 2 ports, and 1 port is communicated with to 4 ports.
In Fig. 5, represent different light signal with branch road with different marks on the main line respectively.Can see, in the situation when the transmission link fault does not take place optical communication system shown in Figure 5, comprise from A-B and B-feedthrough signal AB, the BA of A direction, and A-〉C and B-〉following ripple signal AC, the BC of C direction, C-〉A and C-〉last ripple signal CA, the CB of B direction.
A-〉the feedthrough signal AB of B direction is from A end input, through WDM1,1(is in pass-through state through the optical coupling loopback apparatus), through WDM2, from the output of B end; In like manner, B-〉the feedthrough signal BA of A direction is from the input of B end, through WDM3,1(is in pass-through state through the optical coupling loopback apparatus), through WDM4, from the output of A end.
A-〉the following ripple signal AC of C direction is from A end input, through WDM1,2(is in pass-through state through the optical coupling loopback apparatus), from the output of C end; C-〉the last ripple signal CA of A direction is from C end input, 2(is in pass-through state through the optical coupling loopback apparatus), through WDM4, from the output of A end.
B-〉the following ripple signal BC of C direction is from B end input, through WDM3,3(is in pass-through state through the optical coupling loopback apparatus), from the output of C end; C-〉the last ripple signal CB of B direction is from C end input, 3(is in pass-through state through the optical coupling loopback apparatus), through WDM2, from the output of B end.
Fig. 6 shows the situation of OADM BU when main line transmission link fault takes place optical communication system according to an embodiment of the invention.At this, the transmission link between the side a and b belongs to the main line of optical communication system, and the transmission link between OADM BU and the C end belongs to the branch road of optical communication system.
Take place under the disconnected cable failure condition in the B side, A-〉B direction feedthrough signal AB and C-〉ripple signal CB can't arrive the B end on the B direction, and B-〉feedthrough signal BA and the B-of A direction〉ripple signal BC also can't arrive OADM BU under the C direction, cause the part power loss, i.e. communication disruption between B end and C end and B end and the A end.If keep C to hold the communication of A end normal, need compensation B-〉luminous power of the loss of A direction, therefore need switch to wrapped state shown in Figure 6 to the state of optical coupling loopback apparatus 1.At this moment signal flows to as follows: A-〉ripple signal AC and C-under the C〉the last ripple signal of A CA flows to constant; A-〉B direction feedthrough signal AB is from A end input, through WDM1, passes through optical coupling loopback apparatus 1 then, turns back to WDM4 and C-then〉the last ripple signal of A CA closes the road, export from the A end.At this moment A-〉under the C ripple signal AC to account for the ratio of total optical power from the output of A end the same with ratio under the normal condition, make it in link, keep original power level, transmission performance keeps stablizing.So just realized the B side cable disaster tolerance function of breaking.A side disaster recovery method is identical with the situation of B side, no longer Ao Shu.Here it is to be noted, though the state of optical coupling loopback apparatus 1 switches to and port one, 4 is connected and port 2,3 is connected in Fig. 6, also possible is only port one, 4 to be connected, namely only make the light signal of importing from an end that does not have fault of guilty culprit link be looped back to this end output, and the light signal of an out of order end not being carried out loopback, this does not influence essence of the present invention.
As seen, in the scheme that the embodiment of the invention proposes, the light signal of when the transmission link fault end that does not have fault of this guilty culprit link being imported is looped back to this end output, utilize the signal of this end input to compensate the signal that loses owing to the transmission link fault, keep the power level in the link of this transmission link guilty culprit, thereby reduced the influence of transmission link fault for other business as much as possible, kept stable transmission performance, improved the disaster tolerance ability of optical communication system.In addition, in the scheme of the embodiment of the invention, extra energy is not introduced in the transmission link, therefore can not introduced spontaneous emission noise, guaranteed the performance of system.
Fig. 7 shows the situation of OADM BU when optical communication system generation branch road transmission link fault according to an embodiment of the invention.At this, the transmission link between the side a and b belongs to the main line of optical communication system, and the transmission link between OADM BU and the C end belongs to the branch road of optical communication system.
A-takes place under the disconnected cable failure condition in the C side〉C, B-under the C ripple signal AC, BC can't arrive C end, C-A, C-the last ripple signal of B CA, CB can't arrive side a and b.Communication disruption between A end and C end and B end and the C end.If keep the A end normal with the intercommunication of B end, need compensation C-〉A direction and C-〉the last ripple signal power of loss of B direction, so need switch to wrapped state shown in Figure 7 to the state of optical coupling loopback apparatus 2 and optical coupling loopback apparatus 3.At this moment signal flows to as follows: A-〉B feedthrough signal AB and B-〉A feedthrough signal BA flows to constant; A-〉ripple signal AC through WDM1, passes through optical coupling loopback apparatus 2 from the input of A end then under the C direction, turns back to WDM4 and B-then〉the A feedthrough signal closes the road, from the output of A end.B-〉ripple signal BC through WDM3, passes through optical coupling loopback apparatus 3 from the input of B end then under the C direction, turns back to WDM2 and A-then〉B feedthrough signal AB closes the road, from the output of B end.At this moment A-〉B feedthrough signal AB and B-〉to account for the ratio of total optical power the same with ratio under the normal condition for A feedthrough signal BA, makes it keep original power level in link, and it is stable that transmission performance keeps.So just realized the C side cable disaster tolerance function of breaking.
When branch road C website up and down wave number more after a little while, the disconnected cable of branch road is smaller to the influence on main line, also can omit optical coupling loopback apparatus 2 and optical coupling loopback apparatus 3 in the practical application scene.Also be unrealized at the disaster tolerance function of C side branch road this moment.In addition, similarly, though optical coupling loopback apparatus 2,3 state switch to and respectively port one, 4 connected and port 2,3 is connected in Fig. 7, also possible is only respectively port 2,3 to be connected, and this does not influence essence of the present invention.
As seen, in the scheme that the embodiment of the invention proposes, the light signal of when the transmission link fault end that does not have fault of this guilty culprit link being imported is looped back to this end output, utilize the signal of this end input to compensate the signal that loses owing to the transmission link fault, keep the power level in the link of this transmission link guilty culprit, thereby reduced the influence of transmission link fault for other business as much as possible, kept stable transmission performance, improved the disaster tolerance ability of optical communication system.In addition, in the scheme of the embodiment of the invention, extra energy is not introduced in the transmission link, therefore can not introduced spontaneous emission noise, guaranteed the performance of system.
In addition, also can be only on the main line or only in branch road, realize the disaster tolerance function.
Fig. 8 shows the embodiment of the invention that only realizes the disaster tolerance function in the main line, wherein can see, only the main line between side a and b is provided with the optical coupling loopback apparatus, wherein when the transmission link fault is on the main line, the pass-through state when being connected this optical coupling loopback apparatus on the main line from operate as normal switches to wrapped state.Fig. 9 shows the embodiment of the invention that only realizes the disaster tolerance function in branch road, wherein can see, only be provided with the optical coupling loopback apparatus on the main line at C end place, wherein when the transmission link fault is on branch road, the pass-through state when being connected optical coupling loopback apparatus on the branch road from operate as normal switches to wrapped state.
In the embodiment of Fig. 6 to Fig. 9, the optical add/drop multiplexer branch units is the OADM BU of three ports.
Figure 10 shows a kind of OADM BU of four ports.At this, the transmission link between the side a and b belongs to the main line of optical communication system, and other transmission links belong to the branch road of optical communication system.As seen, comprising 5 optical coupling loopback apparatus.When A side or B side broke down, optical coupling loopback apparatus 1 switched to wrapped state; When the C side broke down, optical coupling loopback apparatus 2,3 switched to wrapped state; When the D side broke down, optical coupling loopback apparatus 4,5 switched to wrapped state.
Figure 11 also shows the OADM BU of another kind of four ports.At this, the transmission link between the side a and b belongs to the main line of optical communication system, and other transmission links belong to the branch road of optical communication system.As seen, comprising 6 optical coupling loopback apparatus.When the A side broke down, optical coupling loopback apparatus 1 switched to wrapped state; When the B side broke down, optical coupling loopback apparatus 4 switched to wrapped state; When the C side broke down, optical coupling loopback apparatus 2,3 switched to wrapped state; When the D side broke down, optical coupling loopback apparatus 5,6 switched to wrapped state.
The embodiment that flows to according to the front about the concrete signal after switching among Figure 10 and Figure 11 can obtain easily, no longer is elaborated here.
It is pointed out that the scheme of the embodiment of the invention is not limited to the situation of above-mentioned three ports or four ports.Based on the instruction of the embodiment of the invention, those skilled in the art expand to it easily has the more OADM BU of multiport.
As seen, in the scheme that the embodiment of the invention proposes, light signal with the end input of the link at place when the transmission link fault is looped back to this end output, utilize the signal of this end input to compensate the signal that loses owing to the transmission link fault, thereby reduced the influence of transmission link fault for other business as much as possible, improved the disaster tolerance ability of optical communication system.In addition, in the Disaster Tolerant Scheme that the embodiment of the invention proposes, transmission link is simple in structure, and the element number is less, therefore also has advantage cheaply.In addition, it doesn't matter for the Add/drop wavelength in this Disaster Tolerant Scheme and the optical communication system, wave number, therefore has stronger universality.In addition, in the scheme of the embodiment of the invention, extra energy is not introduced in the transmission link, therefore can not introduced spontaneous emission noise, guaranteed the performance of system.
In embodiments of the present invention, the optical coupling loopback apparatus is a kind of 2 * 2 optical switches, and it can be realized in several ways.
Figure 12 a and Figure 12 b show the another kind of way of realization according to the optical coupling loopback apparatus of the embodiment of the invention.As seen, this optical coupling loopback apparatus is made of optical coupler and bifurcation optical switch.Shown in Figure 12 a and Figure 12 b be when not having the transmission link fault, light opens the light and is in normal primary importance.And when the transmission link fault took place, optical switch switched to the different other second place to that indicated in the drawings, makes two transmission links that direction is parallel be communicated with.
It is to be noted, Figure 12 a and Figure 12 b only show the part of optical coupling loopback apparatus, for example be to relate to port one, 4 part or port 2,3 part in the optical coupling loopback apparatus among Fig. 5 to Figure 11, each optical coupling loopback apparatus can comprise the structure shown in two Figure 12 a, Figure 12 b during practical application.For example can use the structure shown in two structures shown in Figure 12 a or two Figure 12 b respectively, also can use the structure shown in a structure shown in Figure 12 a and Figure 12 b.In addition, as described in the embodiment of front, also can only make the light signal of importing from an end that does not have fault of guilty culprit link be looped back to this end output, and the light signal of an out of order end is not carried out loopback, can only need the structure shown in Figure 12 a or Figure 12 b to get final product in this case, can realize purpose of the present invention equally.
Figure 13 shows the another kind of way of realization according to the optical coupling loopback apparatus of the embodiment of the invention.As seen, this optical coupling loopback apparatus can be made of optical coupler and light blockout device.When not having the transmission link fault, light blockout device is in blocking state, two transmission link operate as normal that direction is parallel, and when the transmission link fault took place, light blockout device switched to conducting state, thus two transmission links that direction is parallel are communicated with.
It is to be noted equally, Figure 13 only shows the part of optical coupling loopback apparatus, for example be to relate to port one, 4 part or port 2,3 part in the optical coupling loopback apparatus among Fig. 5 to Figure 11, each optical coupling loopback apparatus can comprise two structures shown in Figure 13 during practical application, also can comprise only such structure.
As seen, in embodiments of the present invention, extra energy is not introduced in the transmission link, therefore can not introduced spontaneous emission noise, guaranteed the performance of system.
Also it is to be noted, the implication of the transmission link fault in the embodiment of the invention is that light signal can't normally transmit in transmission link, can comprise not being the scene of optical fault, as the open circuit of powering, short circuit cause repeater to work, light signal can't conducting on the phenomenon, at this moment also can adopt the scheme of the embodiment of the invention to realize disaster tolerance.
Top embodiment only is exemplary, it will be appreciated by persons skilled in the art that the mode that also can adopt other realizes described optical coupling loopback apparatus.
It should be appreciated by those skilled in the art that the function that is divided into of apparatus module is divided in the embodiment of the invention, actual concrete structure can be fractionation or the merging of above-mentioned functions module.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
The scheme of the content record of claim also is the protection range of the embodiment of the invention.
One of ordinary skill in the art will appreciate that all or part of processing in above-described embodiment method is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. disaster recovery method that uses the optical communication system of optical add/drop multiplexer OADM comprises:
Detect the transmission link fault in the optical communication system,
When detecting the transmission link fault, the link of described transmission link guilty culprit is switched to wrapped state from pass-through state, make to be looped back to this end output from the light signal of the end input that does not have fault of described link.
2. method according to claim 1, wherein
When the link of described transmission link guilty culprit is the main line, described main line is switched to wrapped state from pass-through state.
3. method according to claim 1 and 2, wherein
When the link of described transmission link guilty culprit is branch road, described branch road is switched to wrapped state from pass-through state.
4. according to each the described method in the claim 1 to 3, also comprise:
When detecting described transmission link fault and disappear, the link of controlling described transmission link guilty culprit switches to pass-through state from wrapped state.
5. optical add/drop multiplexer branch units OADM BU, be configured to when the transmission link fault appears in the transmission link at described OADM BU place, the link of described transmission link guilty culprit is switched to wrapped state from pass-through state, make the light signal of importing from an end that does not have fault of described link be looped back to this end output
Wherein said OADM BU specifically comprises at least one optical coupling loopback apparatus, at least two main line ports and at least one tributary port, described optical coupling loopback apparatus is connected on the main line between the port of main line, perhaps be connected on the branch road at tributary port place, perhaps be connected on the described main line and described branch road on
Described optical coupling loopback apparatus has pass-through state and wrapped state, when there is the transmission link fault in the link at optical coupling loopback apparatus place, pass-through state when described optical coupling loopback apparatus can be from operate as normal switches to wrapped state, makes to be looped back to this end output from the light signal of the end input that does not have fault of described optical coupling loopback apparatus.
6. optical add/drop multiplexer branch units according to claim 5, wherein when the transmission link fault is on the main line, the pass-through state when being connected optical coupling loopback apparatus on the main line from operate as normal switches to wrapped state.
7. according to claim 5 or 6 described optical add/drop multiplexer branch unitss, wherein when the transmission link fault is on branch road, the pass-through state when being connected optical coupling loopback apparatus on the branch road from operate as normal switches to wrapped state.
8. according to each the described optical add/drop multiplexer branch units in the claim 5 to 7, also comprise wavelength division multiplexer, for the road of closing of the feedthrough signal of going up ripple signal and main line, perhaps descend the shunt of the feedthrough signal in ripple signal and the main line,
9. according to each the described optical add/drop multiplexer branch units in the claim 5 to 8, the optical add/drop multiplexer branch units that wherein said optical add/drop multiplexer branch units is three ports.
According in the claim 5 to 9 each one of described optical add/drop multiplexer branch units, wherein said optical coupling loopback apparatus is optical switch.
11. according to each the described optical add/drop multiplexer branch units in the claim 5 to 10, wherein said optical coupling loopback apparatus is made of optical coupler and light blockout device, perhaps is made of optical coupler and optical switch.
12. the disaster tolerance system of an optical communication comprises:
Checkout gear, for detection of the transmission link fault in the optical communication system, and
According to the described optical add/drop multiplexer branch units of one of claim 4-11.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2012/076979 WO2013185338A1 (en) | 2012-06-15 | 2012-06-15 | Disaster recovery method, device and disaster recovery system of optical communication system |
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| Publication Number | Publication Date |
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| CN103190094A true CN103190094A (en) | 2013-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012800022300A Pending CN103190094A (en) | 2012-06-15 | 2012-06-15 | Optical communication system disaster capacity method, device and disaster capacity system |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20140255020A1 (en) |
| EP (1) | EP2770654A4 (en) |
| JP (1) | JP2015506148A (en) |
| CN (1) | CN103190094A (en) |
| WO (1) | WO2013185338A1 (en) |
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| CN104125009A (en) * | 2014-07-24 | 2014-10-29 | 华中科技大学 | Underwater remote control communication network |
| WO2015070406A1 (en) * | 2013-11-13 | 2015-05-21 | 华为海洋网络有限公司 | Reconfigurable optical add-drop multiplexer apparatus |
| CN105119681A (en) * | 2015-06-25 | 2015-12-02 | 中国船舶重工集团公司第七二四研究所 | Radar signal wavelength division multiplexing module design method based on VPX platform |
| CN105282629A (en) * | 2014-07-03 | 2016-01-27 | 中兴通讯股份有限公司 | Control method and device of silicon optical cross connection |
| CN116582177A (en) * | 2023-07-14 | 2023-08-11 | 华海通信技术有限公司 | Data confidentiality method after submarine cable system fault and submarine cable system |
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| WO2015045303A1 (en) * | 2013-09-26 | 2015-04-02 | 日本電気株式会社 | Optical reception device, optical transmission device, optical communication system, optical communication method, and storage medium with program stored thereon |
| JP6440127B2 (en) * | 2013-12-25 | 2018-12-19 | ▲ホア▼▲ウェイ▼海洋網絡有限公司 | Optical add / drop multiplexer branch unit |
| US20210336694A1 (en) * | 2018-09-10 | 2021-10-28 | Nec Corporation | Path switching apparatus and path switching method |
| US12027844B2 (en) | 2020-10-09 | 2024-07-02 | Smart Wires Inc. | Control of parallel paths during recovery of a power flow control system from a transmission line fault |
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- 2012-06-15 EP EP12878754.6A patent/EP2770654A4/en not_active Withdrawn
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| EP1241806A1 (en) * | 2000-11-22 | 2002-09-18 | Mitsubishi Denki Kabushiki Kaisha | Circuit for switching optical paths |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2013185338A1 (en) | 2013-12-19 |
| JP2015506148A (en) | 2015-02-26 |
| EP2770654A4 (en) | 2014-12-17 |
| EP2770654A1 (en) | 2014-08-27 |
| US20140255020A1 (en) | 2014-09-11 |
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